class_docstr: Base widget type for all pythreejs widgets
docstr: Message callback used internally
docstr_tok: ["Message","callback","used","internally"]
code: def _on_potential_ret_val(self, widget, content, buffers):
      """Message callback used internally"""
      if content["type"] == "exec_three_obj_method_retval":
          self._on_ret_val(content["method_name"], content["ret_val"])
  
file_path: pythreejs/pythreejs/_base/Three.py
imports: from ipywidgets import Widget, widget_serialization
  from traitlets import Unicode
  from .._package import npm_pkg_name
  from .._version import EXTENSION_SPEC_VERSION
label_desc: Use image node_id 3 for calling the ThreeWidget obj's underlying member method code with example usage: obj._on_potential_ret_val(widget, content, buffers) without return types